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What's better, immediately putting a low battery on charge or leaving it 90 minutes before putting it on charge?

Posted: Sun Sep 06, 2020 9:53 am
by MassDeduction
It's easy to get lists of battery best practices, things such as wait 90 minutes before putting it on charge, not charging it above 80%, storing it near 50%, etc. But they rarely address the fact that some suggestions can be mutually exclusive. For example, if you finish a trip at 25% charge, you're well below the ideal charge to store the car at, but if you immediately put it on charge then you're not giving the battery any time to cool down beforehand.

My normal inclination is to wait 90 minutes, then charge the battery up to only 50%, then set a timer to get it up to 80% right before the next trip. But different battery chemistries benefit more, or less, from the "cool down" period before going on charge. And temperature makes a different too, so I suppose it can depend.

Thoughts on whether someone living in a mild climate with a 2016 Kia Soul EV would benefit more from a 90 minute cool down before any charging, or would benefit more from immediately charging back up to 50%?

Re: What's better, immediately putting a low battery on charge or leaving it 90 minutes before putting it on charge?

Posted: Sun Sep 06, 2020 11:49 am
by JejuSoul
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My practice, if I arrive home at 6pm with 30% and don't need the car again that evening would be :
Plug in and set the timer to start at 11pm when rates are cheapest. Charge to 80%.
This lets the battery cool down first and charges when it is cooler.

I have a 32A charger. If you were charging at 6A you would probably have to start earlier.

Re: What's better, immediately putting a low battery on charge or leaving it 90 minutes before putting it on charge?

Posted: Mon Sep 14, 2020 4:00 pm
by tinsley207
I'm interested in this too. I'm new to the form BTW and I'm a proud new owner of a 2016 Soul with 15k miles on it! Today I ran it down pretty far, 14% left. I parked it and set the timer for 80% to start at 4am. That was about 3 hours ago. Should I give it a little "boost" right now to 50%? Or is it ok to sit for several hours at 14% until 4am? Thanks.

PS: I have a 32 amp charger.